Wed, 07 Oct 2026 00:46:14 +0100 https://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18172&Focus=306433#Comment_306433 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18172&Focus=306433#Comment_306433 Fri, 09 Aug 2024 13:11:52 +0100 Victorianeco
I have been quoted £2010 for 109m2 (£18.44m2) which I thought seems reasonable and they are going to see if we can qualify under Eco4 or similar which would be great

The product they propose is Superbead Graphite which appears to have a lambda of 0.032

The cavity is 80mm - what sort of U values would this product yield? Standard brick internal and external skin with render external and render/skim internal?

Questions:

- Is this a must before we even consider EWI?
- Is this suitable for a seafront property (installer said yes)
- Should we do this before or after we install new windows? We may adjust a few openings but imagine as it will be bonded there won't be fallout like the old loose fill material
- Price okay? I think it is decent and not something we could set up ourselves (compressor, spray, materials, labour)]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18172&Focus=306436#Comment_306436 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18172&Focus=306436#Comment_306436 Fri, 09 Aug 2024 22:02:40 +0100 Nick Parsons
Round about 0.3W/m2K - maybe slightly better

Questions:

- Is this a must before we even consider EWI?

In my view (and that of many others, yes. If you have a rare, completely air-tight cavity then maybe not, but I would not have taken the risk.

- Is this suitable for a seafront property (installer said yes)

Certainly more suitable than mineral wool, but ask what exposure region they have 'modelled' you in.

- Should we do this before or after we install new windows? We may adjust a few openings but imagine as it will be bonded there won't be fallout like the old loose fill material

After, I think. The bonding was not that good on mine.

- Price okay? I think it is decent and not something we could set up ourselves (compressor, spray, materials, labour)

Seems about pro rata compared with mine.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18172&Focus=306452#Comment_306452 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18172&Focus=306452#Comment_306452 Tue, 13 Aug 2024 20:50:29 +0100 Victorianeco
The question is whether EWI is then necessary or are there better steps to take]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18172&Focus=306454#Comment_306454 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18172&Focus=306454#Comment_306454 Wed, 14 Aug 2024 09:09:42 +0100 Nick Parsons https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18172&Focus=306468#Comment_306468 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18172&Focus=306468#Comment_306468 Sun, 18 Aug 2024 12:17:34 +0100 wookey And 80m of insulation so U=0.3 isn't _bad_, but of course EWI too is much better. Is it already rendered (for seafront protection?) so it'll look just the same afterwards?]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18172&Focus=306483#Comment_306483 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18172&Focus=306483#Comment_306483 Sun, 18 Aug 2024 20:30:31 +0100 Victorianeco
It seems a lot of time and manpower to make marginal gains, unless of course we were looking to renew every window and frame at this point too which we'd rather do as and when they require replacement or change.

How would one detail the gap of the front to back bricks are removed? It'll then need re rendering and skimming internally - again all this effort and extra works to chase an arbitrary number?]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18172&Focus=306496#Comment_306496 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18172&Focus=306496#Comment_306496 Mon, 19 Aug 2024 14:16:55 +0100 Nick Parsons
I'm not. I am talking about 'cloaking' the thermal bridge - i.e. IWI to the solid brick area. Something like 12mm PIR adhered to 9mm plasterboard or Spacetherm WL (10mm aerogel bonded to 3mm Magnesium oxide board).]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18172&Focus=306497#Comment_306497 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18172&Focus=306497#Comment_306497 Mon, 19 Aug 2024 15:50:00 +0100 djh Posted By: VictorianecoAre you saying to remove windows and cut out the front to back bricks? Just to remove a thermal bridge?Wookey didn't tell you to do anything. He just stated what he has already done. Perhaps your priorities are different to his. That's no reason to disrespect them.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18172&Focus=306516#Comment_306516 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18172&Focus=306516#Comment_306516 Tue, 20 Aug 2024 21:09:31 +0100 Victorianeco
Would it be okay to just EWI the front elevation of the property (for now)? I guess you would need to return the side elevations by at least 1lm?]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18172&Focus=306606#Comment_306606 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18172&Focus=306606#Comment_306606 Wed, 28 Aug 2024 03:00:14 +0100 wookey Posted By: VictorianecoAre you saying to remove windows and cut out the front to back bricks? Just to remove a thermal bridge?

I could cut out the bricks without removing the windows. Obviously it depends how/where your windows are set in the brickwork but it's quite common for them to be in the outer leaf.

I cut out the thermal bridge _and_ added 25mm PUR in the reveal. And yes it's a lot of faff and mess. But the details around windows make a surprising difference. Not sure I ever actually modelled the psi-value for this but it definitely improves the junction.

A decade or so later we got new 3G windows which were moved back in-line with the insulation to further reduce the psi. They would have been somewhat compromised had the thermal bridge remained in place.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18172&Focus=306608#Comment_306608 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18172&Focus=306608#Comment_306608 Wed, 28 Aug 2024 08:11:16 +0100 Victorianeco
If not, locate them on the outer face and then EWI up to them?]]>